Graduate Thesis Or Dissertation

 

Phenotypic comparison of hatchery and wild coho salmon (Oncorhynchus kisutch) in Oregon, Washington, and California Public Deposited

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  • Phenotypic similarities of coho salmon (Oncorhynchus kisutch) stocks from Oregon, Washington, and California were compared using agglomerative and divisive cluster analyses. The phenotypic characters evaluated included the following: 1) the isozyme gene frequencies of transferrin and phosphoglucose isomerase; 2) the life history characters time of peak spawning and proportion of females in the population; and 3) the morphological characters scales in the lateral series, scales above the lateral line, anal rays, gill rakers, branchiostegal rays and vertebrae. Coho salmon stocks from similar environments were phenotypically similar. The groups of stocks found to be similar by the agglomerative cluster analysis were: 1) wild stocks from the northern Oregon coast; 2) wild stocks from the southern Oregon coast; 3) stocks from hatcheries using wild coho salmon for an egg source; 4) stocks from large stream systems; and 5) hatchery stocks from the northern Oregon coast. There were three trends involved with the clustering patterns: 1) stocks that are geographically close tend to be phenotypically similar; 2) stocks from large stream systems were more similar to each other than to stocks from smaller stream systems, independent of geographic nearness; and 3) hatchery stocks were more similar to each other than to wild stocks, even those in their respective stream systems, and wild stocks were more similar to each other than to hatchery stocks, even those in their respective stream systems. These trends may be useful to fishery managers for selecting donor stocks from hatcheries for transplanting to stream systems or other hatcheries. Individual phenotypic characters were correlated with characters of the stream systems. Two agglomerative cluster analyses of the characters of the stocks and the characters of the stream system were used to determine whether stream types corresponded to phenotype- types. The clustering patterns of phenotypic characters of the stocks were not similar to the clustering found for characteristics of the stream systems from which the stocks came.
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